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| Archive Reference / Library Class No. | NCB/A/BUT/6/4/2 |
| Former Reference | N5/229 |
| Title | Butterley Company correspondence file on mine shafts for Portland Colliery, with plans |
| Date | Jul 1913-Jul 1918 |
| Description | Including with Hew Hucknall Colliery Company for Deep Soft seam pillars at Pits Nos. 4 and 5, Jul 1913-Jan 1917, and damning or plugging of shafts at Nos. 1-3, Aug 1917-Jul 1918 |
| Extent | 1 file |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |
| Format | Document |
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